CN109991777B - Backlight module, preparation method thereof and display device - Google Patents
Backlight module, preparation method thereof and display device Download PDFInfo
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- CN109991777B CN109991777B CN201910280664.0A CN201910280664A CN109991777B CN 109991777 B CN109991777 B CN 109991777B CN 201910280664 A CN201910280664 A CN 201910280664A CN 109991777 B CN109991777 B CN 109991777B
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/1333—Constructional arrangements; Manufacturing methods
- G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
- G02F1/1336—Illuminating devices
- G02F1/133615—Edge-illuminating devices, i.e. illuminating from the side
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/1333—Constructional arrangements; Manufacturing methods
- G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
- G02F1/1336—Illuminating devices
- G02F1/133614—Illuminating devices using photoluminescence, e.g. phosphors illuminated by UV or blue light
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- Optics & Photonics (AREA)
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Abstract
The application provides a backlight module, a preparation method thereof and a display device, wherein the backlight module comprises a blue light source, a light guide structure and a yellow light quantum dot structure; the blue light source is used for emitting blue light; the light guide structure is used for converting the blue light into a surface light source and emitting the blue light, and is arranged on one side of the blue light source; the yellow light quantum dot structure is used for contacting with blue light of the surface light source to generate white light and emit the white light, and the yellow light quantum dot structure is arranged on the light emitting surface of the light guide structure; the yellow light quantum dot structure comprises a substrate and a yellow light quantum dot layer, wherein the yellow light quantum dot layer is formed on the substrate. The yellow light quantum dot layer is formed on the substrate and is integrated with the light guide structure and the blue light source in an attaching mode, and the thickness of the backlight module is reduced.
Description
Technical Field
The present disclosure relates to display technologies, and particularly to a backlight module, a method for manufacturing the backlight module, and a display device.
Background
The main components of the liquid crystal display screen comprise two parts: backlight module and liquid crystal display panel. The thickness of the existing backlight module is large, which is not beneficial to thinning the liquid crystal display screen.
Disclosure of Invention
The embodiment of the application provides a backlight module, a preparation method thereof and a display device, and aims to solve the technical problem that the existing backlight module is large in thickness.
The embodiment of the application provides a backlight unit, it includes:
a blue light source for emitting blue light;
the light guide structure is used for converting the blue light into a surface light source and emitting the blue light, and the light guide structure is arranged on one side of the blue light source; and
the yellow light quantum dot structure is used for contacting with the blue light of the surface light source to generate white light and emit the white light, and the yellow light quantum dot structure is arranged on the light emitting surface of the light guide structure;
the yellow light quantum dot structure comprises a substrate and a yellow light quantum dot layer, wherein the yellow light quantum dot layer is formed on the substrate.
In the backlight module of the present application, the yellow light quantum dot layer and the light guide structure are located on two sides or the same side of the substrate.
In the backlight module, the substrate is a glass substrate, and the yellow light quantum dot layer is made of yellow light-emitting quantum dots with set functional groups; the surface of the glass substrate is provided with hydroxyl active functional groups, and the set functional groups can perform grafting reaction with hydroxyl.
In the backlight module of the present application, the setting functional group is a carboxyl functional group.
In the backlight module of the present application, the blue light source is an LED lamp, and the light guide structure is a light guide plate or a light guide film.
Correspondingly, the application relates to a preparation method of a backlight module, which comprises the following steps:
providing a substrate;
etching and activating one surface of the substrate;
grafting yellow light-emitting quantum dots to the surface to form a yellow light quantum dot layer on the substrate; the substrate and the yellow light quantum dot layer form a yellow light quantum dot structure;
disposing a light directing structure on the yellow light quantum dot structure;
and a blue light source is arranged on one side of the substrate facing the light guide structure and positioned on one side of the light guide structure.
In the preparation method of the backlight module, the substrate is a glass substrate; the etching and activating treatment of one surface of the substrate comprises:
and spraying first strong acid and second strong acid on one surface of the glass substrate to carry out etching and activating treatment, so that hydroxyl active functional groups are generated on the surface of the glass.
In the method for preparing the backlight module, the first strong acid is hydrofluoric acid, and the second strong acid is one of hydrochloric acid, sulfuric acid and nitric acid.
In the preparation method of the backlight module, the yellow light quantum dots have carboxyl functional groups which are subjected to grafting reaction with hydroxyl active functional groups.
The application still relates to a display device, be in including backlight unit and setting display panel on the backlight unit, backlight unit includes:
a blue light source for emitting blue light;
the light guide structure is used for converting the blue light into a surface light source and emitting the blue light, and the light guide structure is arranged on one side of the blue light source; and
the yellow light quantum dot structure is used for converting the blue light of the surface light source into white light and emitting the white light, and the yellow light quantum dot structure is arranged on the light emitting surface of the light guide structure;
the yellow light quantum dot structure comprises a substrate and a yellow light quantum dot layer, wherein the yellow light quantum dot layer is formed on the substrate.
In the display device of the present application, the yellow light quantum dot layer and the light guide structure are located on both sides or the same side of the substrate.
In the display device of the present application, the substrate is a glass substrate, and the yellow light quantum dot layer is made of yellow light emitting quantum dots having a predetermined functional group; the surface of the glass substrate is provided with hydroxyl active functional groups, and the set functional groups can perform grafting reaction with hydroxyl.
In the display device of the present application, the setting functional group is a carboxyl functional group.
In the display device of the application, the blue light source is an LED lamp, and the light guide structure is a light guide plate or a light guide film.
Compared with the backlight module in the prior art, the backlight module, the preparation method thereof and the display device have the advantages that the yellow light quantum dot layer is formed on the substrate and is integrated with the light guide structure and the blue light source in a bonding mode, and the thickness of the backlight module is reduced; the technical problem of large thickness of the existing backlight module is solved.
Drawings
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required in the embodiments are briefly described below. The drawings in the following description are only some embodiments of the present application, and it will be obvious to those skilled in the art that other drawings can be obtained from the drawings without inventive effort.
Fig. 1 is a schematic structural diagram of a backlight module according to a first embodiment of the present application;
FIG. 2 is a schematic structural diagram of a backlight module according to a second embodiment of the present application;
FIG. 3 is a flowchart illustrating a method for manufacturing a backlight module according to an embodiment of the present disclosure;
FIG. 4 is another flowchart illustrating a method for manufacturing a backlight module according to an embodiment of the present disclosure;
fig. 5 is a schematic structural diagram of a display device according to an embodiment of the present application.
Detailed Description
Refer to the drawings wherein like reference numbers refer to like elements throughout. The following description is based on illustrated embodiments of the application and should not be taken as limiting the application with respect to other embodiments that are not detailed herein.
Referring to fig. 1, fig. 1 is a schematic structural diagram of a backlight module according to a first embodiment of the present application.
The backlight module 100 of the first embodiment of the present application includes a blue light source 10, a light guide structure 20, and a yellow light quantum dot structure 30.
The blue light source 10 is for emitting blue light. The light guide structure 20 is used to convert the blue light into a surface light source and emit the blue light. The light guide structure 20 is disposed at one side of the blue light source 10. The yellow light quantum dot structure 30 is used for contacting with the blue light of the surface light source to generate white light and emit the white light. The yellow light quantum dot structure 30 is disposed on the light emitting surface of the light guide structure 30.
The yellow light quantum dot structure 30 includes a substrate 31 and a yellow light quantum dot layer 32. A yellow quantum dot layer 32 is formed on the substrate 31.
In the backlight module 100 of the first embodiment of the present application, the yellow quantum dot layer 32 is formed on the substrate 31 to form the yellow quantum dot structure 30, and the yellow quantum dot structure 30 is attached to the light guide structure 20 and the blue light source 10, so as to reduce the thickness of the backlight module 100.
It should be noted that, the first embodiment of the present application is a side-in type backlight module, but the present application may also be a direct type backlight module, for example, the direct type backlight module includes the above-mentioned yellow light quantum dot structure and a blue light source disposed at the light incident surface of the yellow light quantum dot structure. The blue light source is directly positioned under the yellow light quantum dot structure. By the arrangement, the light guide structure is saved.
In the backlight module 100 of the first embodiment, the yellow light quantum dot layer 32 and the light guide structure 20 are located on two sides of the substrate 31.
In the backlight module 100 of the first embodiment, the substrate 31 is a glass substrate, and the yellow quantum dot layer 32 is made of yellow light-emitting quantum dots having a predetermined functional group. The surface of the glass substrate is provided with hydroxyl active functional groups, and the functional groups can be grafted with hydroxyl. Alternatively, the functional group is set to a carboxyl functional group.
In the backlight module 100 of the first embodiment, the blue light source 10 is an LED lamp. The light guide structure 20 is a light guide plate or a light guide film.
In the backlight module 100 in the first embodiment, the backlight module 100 further includes a reflective film, a fixing frame, and the like.
The working principle of the backlight module 100 of the first embodiment is as follows: the blue light source 10 emits blue light, which is guided and diffusely reflected by the light guide structure 20, and then emitted from the light emitting surface of the light guide structure 20, and enters the yellow quantum dot layer 32 of the yellow quantum dot structure 30. Finally, the blue and yellow quantum dot layers 32 combine to produce white light and emit it.
In the preparation process of the first embodiment of the present application, please refer to the specific contents of the preparation method of the backlight module, which is not described herein again.
Referring to fig. 2, in a backlight module of a second embodiment of the present application, the second embodiment is different from the first embodiment in that: the yellow quantum dot layer 32 and the light guiding structure 20 are located on the same side of the substrate 31.
Correspondingly, please refer to fig. 3, fig. 3 is a flowchart of a method for manufacturing a backlight module according to an embodiment of the present application; fig. 4 is another flowchart of a method for manufacturing a backlight module according to an embodiment of the present disclosure. The present application relates to a method for manufacturing a backlight module 100, which includes:
s11: providing a substrate 31;
s12: etching and activating one surface of the substrate 31;
s13: grafting yellow light-emitting quantum dots to the surface, forming a yellow light quantum dot layer 32 on the substrate 31; the substrate 31 and the yellow quantum dot layer 32 form a yellow quantum dot structure 30;
s14: disposing a light guiding structure 20 on the yellow light quantum dot structure 30;
s15: a blue light source 10 is disposed on a side of the substrate 31 facing the light guide structure 20 and located on a side of the light guide structure 20.
The backlight module of the present invention is the backlight module 100. The following is a detailed description of the process of the backlight module manufacturing method of the present embodiment.
In step S11, a substrate 31 is provided.
Specifically, the substrate 31 is used to provide a supporting structure for the yellow quantum dot layer 32, so as to form the yellow quantum dot layer 32 subsequently. The substrate 31 may be a glass substrate, a polyimide thin substrate, or the like. In addition, since the substrate 31 also needs to support a part of external devices, such as a display panel, the substrate 31 is a glass substrate.
Subsequently, the process proceeds to step S12.
In step S12, a surface of the substrate 31 is subjected to etching and activation processing.
Specifically, one surface of the glass substrate is subjected to etching and activation treatment by spraying first strong acid and second strong acid, so that hydroxyl active functional groups are generated on the surface of the glass.
Of course, if the present embodiment is used only for forming the yellow quantum dot layer 32, the reactive functional groups generated on the upper surface of the substrate 31 are not limited to hydroxyl groups.
In addition, in this step, the first strong acid is hydrofluoric acid, and the second strong acid is one of hydrochloric acid, sulfuric acid, and nitric acid, but is not limited thereto. Can activate the surface of the glass. In this embodiment, the first strong acid is hydrofluoric acid, and the second strong acid is hydrochloric acid, and the first strong acid and the second strong acid are mixed to form a mixed solution, wherein the hydrofluoric acid accounts for 3-8% of the mixed solution, and the hydrochloric acid accounts for 10-35% of the mixed solution.
And then proceeds to S13.
In step S13, yellow light emitting quantum dots are grafted to the surface, forming a yellow light quantum dot layer 32 on the substrate 31.
Specifically, the substrate 31 and the yellow quantum dot layer 32 form a yellow quantum dot structure 30. The yellow light quantum dots have carboxyl functional groups which are subjected to grafting reaction with hydroxyl active functional groups or other functional groups which can be reacted with hydroxyl. The yellow quantum dots are formed on the substrate 31 by coating.
After the yellow quantum dot layer 32 is coated and grafted, the yellow quantum dot structure 30 is baked to form a dry yellow quantum dot structure 30. Subsequently, the process proceeds to step S14.
In step S14, a light guide structure 20 is disposed on the yellow light quantum dot structure 30. That is, the light guiding structure 20 is attached on the yellow light quantum dot structure 30.
Specifically, the light guide structure 20 is disposed on a side of the substrate 31 facing away from the yellow quantum dot layer 32. In some embodiments, the light guide structure may also be disposed on the yellow quantum dot layer, i.e., on the same side as the yellow quantum dot layer. The light guide structure 20 may be a light guide film or a light guide plate.
Subsequently, the process proceeds to step S15.
In step S15, a blue light source 10 is disposed on a side of the substrate 31 facing the light guide structure 20 and located on a side of the light guide structure 20.
This completes the preparation process of this example.
If a display device using the backlight module 100 as a substrate needs to be manufactured, the display panel needs to be bonded and encapsulated on the yellow light quantum dot structure 30.
Referring to fig. 5, fig. 5 is a schematic structural diagram of a display device according to an embodiment of the present application. The present application further relates to a display device 1000 comprising a backlight module 100 and a display panel 200 disposed on the backlight module 100. The backlight module 200 includes a blue light source 10, a light guide structure 20 and a yellow light quantum dot structure 30.
The blue light source 10 is for emitting blue light. The light guide structure 20 is used to convert the blue light into a surface light source and emit the blue light. The light guide structure 20 is disposed at one side of the blue light source 10. The yellow light quantum dot structure 30 is used for contacting with the blue light of the surface light source to generate white light and emit the white light. The yellow light quantum dot structure 30 is disposed on the light emitting surface of the light guide structure 30.
The yellow light quantum dot structure 30 includes a substrate 31 and a yellow light quantum dot layer 32. A yellow quantum dot layer 32 is formed on the substrate 31.
In the backlight module 100 of the embodiment of the present application, the yellow quantum dot layer 32 is formed on the substrate 31 to form the yellow quantum dot structure 30, and the yellow quantum dot structure 30, the light guide structure 20 and the blue light source 10 are bonded and integrated together, so that the thickness of the backlight module 100 is reduced.
In the backlight module 100 of the present embodiment, the yellow quantum dot layer 32 and the light guide structure 20 are located on two sides of the substrate 31.
In the backlight module 100 of the present embodiment, the substrate 31 is a glass substrate, and the yellow quantum dot layer 32 is made of yellow light-emitting quantum dots having a predetermined functional group. The surface of the glass substrate is provided with hydroxyl active functional groups, and the functional groups can be grafted with hydroxyl. Alternatively, the functional group is set to a carboxyl functional group.
In the backlight module 100 of the present embodiment, the blue light source 10 is an LED lamp. The light guide structure 20 is a light guide plate or a light guide film.
In the backlight module 100 of the present embodiment, the backlight module 100 further includes a reflective film, a fixing frame, and the like.
The working principle of the backlight module 100 of the present embodiment is as follows: the blue light source 10 emits blue light, which is guided and diffusely reflected by the light guide structure 20, and then emitted from the light emitting surface of the light guide structure 20, and enters the yellow quantum dot layer 32 of the yellow quantum dot structure 30. Finally, the blue and yellow quantum dot layers 32 combine to produce white light and emit it.
In this embodiment, the display panel 200 includes an array substrate, a liquid crystal layer, and a color film substrate. The array substrate and the color film substrate are both provided with polarizers. Since the display panel 200 is a conventional display panel, the description thereof is omitted.
Compared with the backlight module in the prior art, the backlight module, the preparation method thereof and the display device have the advantages that the yellow light quantum dot layer is formed on the substrate and is integrated with the light guide structure and the blue light source in a bonding mode, and the thickness of the backlight module is reduced; the technical problem of large thickness of the existing backlight module is solved.
As described above, it will be apparent to those skilled in the art that various other changes and modifications can be made based on the technical solution and the technical idea of the present invention, and all such changes and modifications should fall within the protective scope of the appended claims.
Claims (9)
1. A method for manufacturing a backlight module is characterized by comprising the following steps:
providing a substrate;
etching and activating one surface of the substrate;
grafting yellow light-emitting quantum dots to the surface to form a yellow light quantum dot layer on the substrate; the substrate and the yellow light quantum dot layer form a yellow light quantum dot structure;
disposing a light directing structure on the yellow light quantum dot structure;
and a blue light source is arranged on one side of the substrate facing the light guide structure and at the side end of the light guide structure.
2. The method of claim 1, wherein the substrate is a glass substrate; the etching and activating treatment of one surface of the substrate comprises:
and spraying first strong acid and second strong acid on one surface of the glass substrate to carry out etching and activating treatment, so that hydroxyl active functional groups are generated on the surface of the glass.
3. The method of claim 2, wherein the first strong acid is hydrofluoric acid and the second strong acid is one of hydrochloric acid, sulfuric acid and nitric acid.
4. The method of claim 2, wherein the yellow light quantum dots have carboxyl functional groups grafted with hydroxyl reactive functional groups.
5. A backlight module formed by the method of any one of claims 1 to 4, the backlight module comprising:
the blue light source is used for emitting blue light;
the light guide structure is used for converting the blue light into a surface light source and emitting the blue light, and the light guide structure is arranged on one side of the blue light source; and
the yellow light quantum dot structure is used for contacting with the blue light of the surface light source to generate white light and emit the white light, and the yellow light quantum dot structure is attached to the light emitting surface of the light guide structure;
the yellow light quantum dot structure comprises a substrate and a yellow light quantum dot layer, wherein the yellow light quantum dot layer is formed on the substrate.
6. The backlight module of claim 5, wherein the yellow quantum dot layer and the light guide structure are located on two sides or the same side of the substrate.
7. The backlight module as claimed in claim 5, wherein the blue light source is an LED lamp, and the light guide structure is a light guide plate or a light guide film.
8. The backlight module according to claim 5, wherein the substrate is a glass substrate, and the yellow quantum dot layer is made of yellow light-emitting quantum dots having carboxyl functional groups; the surface of the glass substrate is provided with a hydroxyl active functional group, and the carboxyl functional group and the hydroxyl active functional group are subjected to grafting reaction.
9. A display device comprising a backlight module and a display panel arranged on the backlight module, wherein the backlight module is according to any one of claims 5-8.
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| CN201910280664.0A CN109991777B (en) | 2019-04-09 | 2019-04-09 | Backlight module, preparation method thereof and display device |
| PCT/CN2019/083996 WO2020206738A1 (en) | 2019-04-09 | 2019-04-24 | Backlight module and manufacturing method thereof, and display device |
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| CN201910280664.0A CN109991777B (en) | 2019-04-09 | 2019-04-09 | Backlight module, preparation method thereof and display device |
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| CN113741098B (en) * | 2021-11-04 | 2022-03-01 | 拓米(成都)应用技术研究院有限公司 | UTG-QD type MINI-LED board and application, preparation method and optical framework thereof |
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| WO2020206738A1 (en) | 2020-10-15 |
| CN109991777A (en) | 2019-07-09 |
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